Composition of matter.



terior of a digester after the cook, that,

SAMUEL A. LEAVIT'P, OF GORHAM, NEW HAMPSHIRE.

oouro'srrzon or MATTER.

Specification of Letters Patent.

Patented Aug. 10, 1909.

Applicationfiled Hatch 16, 1908. Serial No. 421,463.

To all whom it may concern:

Be it .known that I,, ,SAMUEL A. LEAVITT, a citizen of the Unit States of America, residing at the town 0 Gorham, in the State of New Hampshire, in the United States of.

America, have invented certain new and useful Improvements In a Composition of Matter, of which the following is a speclfication.

- The invention relates to "new and useful acid-proof composition of matter adapted to be applied in its plastic state, and having 'valuable properties as a cement.

The inventionconsists essentially in the mixture in or about the proportions named of QCId'pIOOf and other elements to produce a plastic mass, as fully described in the present specification and pointed out in the claims. i

The composition is made up of 20 to 30 parts litharge, 10 to 15 parts quartz, 5 to 10 parts calcined plaster, and 1 to 5 parts lampblack. The above ingredients are ground to a suitable degree of fineness, and are then thoroughly mixed with a liquid, such as glycerin, suflicient liquid being added, ap-- proximately 10 to 15 parts, to bring the mixture to a mortarcement state. The

above ingredients are all easily obtained and IIIGXPBIISIVQ, this being an important factor "where the compound is used as a mortar, as in' ining pulp-wood digesters with brick.

licretofore no substance has been known, which will effectually withstand the heat and pressure of sulfuric acid, as found in the operation of these digesters and at the same time fulfil'the requirements of an adequate mortar for retaining the brick lining in position. I

In actual use, as above described, the inis the pulp-Wood, sulfuric acid and steam has been blown or emptied from the digeste'r, will always show a dampness on the surface due to the glycerin, part of which Works its Way to the-surface on the contraction of the lining, which glycerin is absorbed when the digester is' again heated.

An important feature of the above-clescribed compositionv of matter is that whenheated it possesses a certain degree of elasticity, which enables it to expand with any substance to which itmay be applied Without cracking or separating'from the said substance.

\ The composition of matter makes an-excellent substance for cement purposes, and

may be applied in its plastic state to meet the requirements of a cement, for filling or for the protection of any substance subjected to the action of heat and acids.

What I claim as my inventionis:

1. The hereindescribed expansile acidproof cement for lining digesters or the like, consisting of lithargc, quartz, calcined plaster and lamp black, all brought to'a plastic condition by the admixture of glycerin.

2. The herein-described expansible acidproof cement for lining digesters or the like, consisting of twenty to thirty parts litharge, ten to fifteen parts quartz, 've to ten parts calcined plaster, one to. five parts lampblack, all brought to a lastic condition by the admixture of ten to fteen parts glycerin.

Signed at the city of Ottawa, in the Province of Ontario, of the Dominion of Canada this 10th day of March 1908.

SAMUEL A. LEAVITT.

\Vitnesses:

Lucy!) BLACKMORE, W. T. CUFFE-QUIN. 

